diff --git a/crc/services/document_service.py b/crc/services/document_service.py
index 3ac82c79..1626cc59 100644
--- a/crc/services/document_service.py
+++ b/crc/services/document_service.py
@@ -5,6 +5,12 @@ from crc.services.lookup_service import LookupService
 
 
 class DocumentService(object):
+    """The document service provides details about the types of documents that can be uploaded to a workflow.
+    This metadata about different document types is managed in an Excel spreadsheet, which can be uploaded at any
+    time to change which documents are accepted, and it allows us to categorize these documents.  At a minimum,
+    the spreadsheet should contain the columns 'code', 'category1', 'category2', 'category3', 'description' and 'id',
+    code is required for all rows in the table, the other fields are optional. """
+
     DOCUMENT_LIST = "irb_documents.xlsx"
 
     @staticmethod
diff --git a/crc/services/study_service.py b/crc/services/study_service.py
index 6b986db4..5d36884f 100644
--- a/crc/services/study_service.py
+++ b/crc/services/study_service.py
@@ -31,8 +31,7 @@ from crc.services.workflow_processor import WorkflowProcessor
 
 class StudyService(object):
     """Provides common tools for working with a Study"""
-    """Provides consistent management and rules for storing, retrieving and processing files."""
-    INVESTIGATOR_LIST = "investigators.xlsx"
+    INVESTIGATOR_LIST = "investigators.xlsx"  # A reference document containing details about what investigators to show, and when.
 
     @staticmethod
     def get_studies_for_user(user):